Carburetor



Dec. 28, 1926.

C. H. DACON CARBURETOR Filed May 6. 1926 2 Sheets-Sheeet. l

c. H. DAcoN CARBURETOR Filed May 6. 1926 2 Sheets-Sheet 2 CHARLES H. BACON, 0F ST.'LOUIS, MISSOURI, SSIGNOR OF ONE-HALF T0 EDWARD Il'.

' BURGDORF, OF ST. LOUIS, MISSOURI.' i

` eannuan'ron.

Application filed May 6, 1926. Serial No. 107,132.

My invention relates to carburetors `and more particularly to carburetors such as are used to supply a combustible mixture of air and gasoline vapor to cylinders of integral combustion engines.

Heretofore in carburetors of this type it has been found that all the gasoline is not vaporized and that, hence, the air passing through the carburetor is not combined only with the vapor of the liquid fuel, but the air serves valso as a carrying agent for minute particles of fuel. This so-called wet mixture is wasteful in that the particles of fuel are not broken up to a degree sufficient to obtain the most power from the combustion which is incomplete, and, therefore, much of the enorgy which should be obtained is lost. Also, this mixture is harmful to the engine because when the wet mixture is injected into the cylinders, some of the drops condense on the piston head, there to be carbonized, or fall on t-he cylinder walls to dilute the oil thereon.

carburetor which will cause a more complete vaporizing of the liquid fuel and will coni-V bine this vapor with the proper amount. of

air, thereby, producing a substantially dry gas which will be easily and completely burned in the cylinders of the engine.

@ine form of a carburetor embodying my invention is fully shown in the accompanying drawings wherein similar letters are used to designate similar parts: Fig. l is a vertical fsection of the carburetor; Fig. 2 `is a horizontal sectionalong the lines 2-2 in 4Fig'. 1; Fig. 3 shows an elevation of the car, buretorgand Fig. -4 shows a' detail of con struction hereinafter more fully explained. Referring to the figures the carburetor has a reservoir 1 for liquid fuel which enters into the reservoir through the main fuel inlet 2 and passes through the strainer screen 8 and through the passage 4 into the reservoir. rlfhe needle valve 5 adapted to seat in the flared upper end 6 of the passage 4 and controlled by the `movement of the yfloat 7 governs the flow of fuel into the reservoir 1 and maintains a predetermined level of fuel therein.

ln the embodiment of my invention shown, the needle valve 5 Vis slidably mounted so as to be capable of axial movement in the bridge 8 nea-r the upper end thereof and in the bridge 9 in the lower end thereof. Secured to the needle valve are the' disks 10 which engage the lingers 1,1 of the crank arms 12. rlhe crank arms 12,7 in turn, are journald on the pins 13 on the valve housing 14, all

as shown in detail in Fig. 1. When the fuel 60 in the reservoir 1 has reached a predetermined level the float 7 raises the balls 15 on the lower ends of the crank arms 12 thereby moving the lingers 11 downwardly and moving the needle valve 5 against the sides of'G5 the flared upper end 6 of the passage 4 to shut otl' further flow of fuel into the reservoir. rlhe housing 14 has the apertures 16 in the lower end thereof just above the upper v end of the passage 4 so that fuel admitted 70 and the strainer screen 3 may be removed for 75 cleaning.

The mixing chamber 17 has an air inlet j V. 18 opening from the air tube 19. The in- 'lhe object of my invention 1s to provlde a let for the flow of air into the air tube 19 and, consequently, through the air in- So let 18 of the mixing chamber may be regulated by the plate 2O which is adjust- Vably mounted over the upper end of the air tube 19. A fuel inlet nozzle 21 is mounted in the mixing chamber and has the 85 needle 23 which has an enlarged lower end no threaded in the boss 24 and is provided with the pin 25 for turning. Fuel is supplied to the fuel inlet nozzle by means of the fuel duct 27 leading from the reservoir 1. The

mixing lchamber 17, preferably, has a veno5 turi 26 positioned a short distance above the inlet opening ofthe nozzle 21. a

The well 28 is, preferably, supplied with fuel from the reservoir 1 by means of the fuel duct 29 and` therefore, the normal level 10o of fuelv in the well 28 will be the same as the predetermined level of fuel maintained in the reservoir.V The well 28 may be provided with a drain plug 30. I

A passageway 31 opens from the mixing 105 chamber 17 at a point above the normal level of fuel in the well 28 and opens into .the well 28 below the normal level of fuel therein. An auxiliary air inlet pipe 32 discharges into the passageway 31 through the 1w y auxiliary air inlet air inlet 33, preferably, positioned below the normal level of fuel in the well 28. The pipe 32, as shown in this embodiment, extends upwardly from the `place of discharge into the passageway 31 to a point above the normal level of fuel in the well 28, and has at its upper end the suction operated valve 34 covered by a screen 35 which normally prevents dust or foreign matter from passing into the auxiliary air inlet, all for the purpose more fully hereinafter set forth.

On the wall of the well 28 and adjacent the opening from the passageway 31 into the well 28 is formed an arcuate shaped lip 36. A splash plate 37 extending inwardly from the walls of the well 28 and, preferably inclining downwardly, asshown in Fi g. 1, is provided above ,the normal level of fuel in the well, and also, a separating screen 38 is positioned in the outlet of the carburetor yabove the splash. plate 37, but below the Y butterfiy valve 39.

The normal level of fuel in the well 28 will be, as stated above, the same as the level in the reservoir 1 and, since. the passageway 31 opens into the well the liquid will normally back up into this passageway, as indicated in Fig. 1. However, when the carburetor is operated as explained below the level of liquid in the well 28 will be raised somewhat and, sincethe average area of cross-section of the passageway 31 is comparatively small compared with the average area of cross-section'of the well 28, the liquid will be sucked out of the passageway 31 and, usually, the discharge opening 33 of the auxiliary air inlet 32 will be above the level of the liquid in the passage 31, which level will be approximately even with the lower edge of the lip 36.

- The operation of this form of my new and improved carburetor lis as follows: When the engine with which the carburetor is used, is cranked the suction created, as ex lained above, will change the normal level o liquid in the well 28 and will create a suction of air into and through the airv tube 19 and through the air inlet 18 into the mixing chamber 17. This air will then be drawn past the inlet 22 of the fuel inlet nozzle 21 1n the mixing chamber Aand be mixed with the fuel sprayed from the fuel inlet nozzle 21, and thisl mixture of air and fuel will pass into the passageway 31 and then downwardly through the'passageway and-under the lower endy of the lip 36 and then will bubble upwardy through the liquid in the well 28. As the mixture bubbles upwardly all of the sustained moisture in the mixture of air and liquid fuel formed in the mixing chamber will be retained by the liquid fuel in the well, and only a mixture of dry vapor and air will be released from the upper surface of fuel in the Well 28. This mixture will pass through the opening in the splash plate 37, through theseparating screen 38- which will separate from the vapor any small particles of liquid Ifuel which may be drawnwith it from the surface of the fuel in the well, and will pass through the intake manifold of the engine into the cylinders to be burned' therein. The mixture vfrom the mixing chamber-17 will be diluted by air sucked into the passageway 31 through the auxiliary air inlet 33 of the air inlet pipe 32 when the suction is suicient to overcome the tension of the spring 41`to allow the valve 34 at the upper end of the air inlet pipe 32 to be moved from its seat.` l prefer that the air from the auxiliary air inlet be discharged into the passageway just above the place of discharge of the duct 29 into said passageway so that the air beforepassing into the Well 28 will take up some Vapor of the fuel by passing `over the fuel discharged from the duct 29. The iiow ofvapor and A.

air through the outlet of the carburetor is controlled by the buttery valve 39.

lt may be readily seen that a device embodying my invention may be made in various forms or shapes and the parts may be placed` in various arrangements without deviating from the spirit .of my invention as embodled in the claims below.

"What I claim as new and desire to secure by Letters Patent, is:

1. In a carburetor, the combination with a reservoir for liquid fuel, a well, .a fuel duct for supplying fuel to said well from said reservoir, a mixing chamber, an air inlet, means for spraying fuel into said mix ing chamber, a passageway opening from said mixing chamber at a point above the normal level of the fuel in said well and opening into said'well belowsaid normal level of fuel therein, and an auxiliary air inlet 'discharging intol said passageway.- v

2. In a carburetor, the combination of a reservoir for li uid fuel, a well, a fuel duct for supplying ucl t0 said well from said reservoir, a mixing chamber having an adjustable fuel inlet and an air inlet, a passageway opening from said mixing chamber at a point above normal level of fuelA in said vwell and opening into said well below said' normal level of fuel therein, and an auxiliary air inlet passageway below. said normal level of fuel in said well. l v

v3. In a carburetor, the 'combination of a reservoir for liquid fuel, means for maindischarging into said.

taining apredetermined level of fuel in said reservoir, a well, a fuel duct leading from said reservoir to said well, a mixin ,chamber having a fuel inlet nozzle disc arging therein, means for supplying liquid fuel from said reservoir to sald nozzle,fsaid mixing chamber also having an air inlet, apassageway opening from said .mixing cham'- narines ber at a point above said normal level of fuel in said well and opening into said well below said normal level of fuel therein, and an auxiliary ,air inlet discharging into said passageway.

mixing chamber at a point. above the normal' level of fuel in said well and opening into said well below said normal` level of fuel therein, and an auxiliary air inlet pipe dischargin into said passageway below said normal evel or fuel in said well, said ,euxiliary air inlet, pipe extending upwardly from the place of discharge into said. passageway to a oint above said normal level of fuel in sai well. l

5. ln a carburetor the combination of a reservoir for liquid fuel, a mixing chamber having an adjustable fuel inlet and an "air inlet, a well, a duct for supplying fuel from said reservoir to said well, a passageway opening from said mixing chamber at a point above the normal level of fuel in said well and opening into said well below said.

normal level of fuel therein, and asplash plate extending inwardly from the Wall of said well above said normal level of fuel therein,

6. lln a carburetor, the combination of a reservoir for liquid fuel, a float operated valve forl maintaining a predetermined leve] of fuel in said reservoir, a mixing chamber having an air inlet, a fuel inlet nozzle disehargmg into said'mixing chamber, a fuel duct for supplying fuel from said reservoir to said nozzle, a Well, a fuel duct for supllly- .ingr fuel from said reservoir to said we passageway opening from said mixing cham'- ber at a point above the normal level of fuel in said Well and opening into said well below said normal level of fuel therein, an

auxiliary air inlet discharging into said l passageway below said normal level of fuel in said well, said auxiliary air inlet extending upwardly from the place of discharge into said passageway to a point above said normal level of fuel in said well, a

suction operated valve arranged to regulate Y* ",the flow of air through said auxiliary air.

inlet, a splash plate extending inwardly from the wall of said well above said normal level of fuel therein, and a screen positioned above said splash plate in the outlet of saidcarbu-retor.

lin witness whereof ll .have to this specification. v

CHARLES H. DAGON.

signed my name 

